[automerger skipped] Fix potential overflow when calculating ImageSize am: 579301a251 am: 447bd9affb am: 1c66ea2460 am: 1ed51ce11c -s ours

am skip reason: Merged-In I2d7d278f2f2926463513c2abe3a73c012b928225 with SHA-1 2181204216 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/giflib/+/29481380

Change-Id: I17193abd07375d8eb4692308871b7f0789cd3a7a
Signed-off-by: Automerger Merge Worker <[email protected]>